Conduits for transporting fluids and methods of fabricating the same

A method of fabricating a conduit, the method comprising steps of:

• attaching a first tubular-outboard-ply end of a tubular outboard ply to a first inner collar portion of a first collar with a third weld;
• attaching a second tubular-outboard-ply end of the tubular outboard ply, which is axially opposite the first tubular-outboard-ply end of the tubular outboard ply, to a second inner collar portion of a second collar with a fifth weld;
• inserting a tubular inboard ply into the tubular outboard ply and advancing the tubular inboard ply along an interior of the tubular outboard ply until a first tubular-inboard-ply end of the tubular inboard ply protrudes a first distance past the first inner collar portion, and a second tubular-inboard-ply end protrudes a second distance past the second inner collar portion, wherein the first distance is greater than a first predetermined distance, and the second distance is greater than a second predetermined distance;
• simultaneously corrugating the tubular inboard ply and the tubular outboard ply to form a bellows, having a central axis and comprising a corrugated outboard ply, a corrugated inboard ply, and an interstitial space, interposed between the corrugated inboard ply and the corrugated outboard ply, wherein the corrugated outboard ply is formed from the tubular outboard ply, and the corrugated inboard ply is formed from the tubular inboard ply;
• trimming a first corrugated-inboard-ply end of the corrugated inboard ply, corresponding to the first tubular-inboard-ply end of the tubular inboard ply, to create a trimmed first corrugated-inboard-ply end that protrudes the first predetermined distance past the first inner collar portion;
• trimming a second corrugated-inboard-ply end of the corrugated inboard ply, corresponding to the second tubular-inboard-ply end of the tubular inboard ply, to create a trimmed second corrugated-inboard-ply end that protrudes the second predetermined distance past the second inner collar portion;
• interconnecting the first inner collar portion and a first outer collar portion of the first collar with a first weld;
• interconnecting the second inner collar portion and a second outer collar portion of the second collar with a sixth weld;
• attaching the trimmed first corrugated-inboard-ply end of the corrugated inboard ply to the first outer collar portion with a second weld;
• attaching the trimmed second corrugated-inboard-ply end of the corrugated inboard ply to the second outer collar portion with a fourth weld;
• and
• communicatively coupling a first sensor with the interstitial space.